Forefathers' Day

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the anniversary of the day (December 21) on which the Pilgrim Fathers landed at Plymouth, Massachusetts (1620). On account of a mistake in reckoning the change from Old Style to New Style, it has generally been celebrated on the 22d.

See also: Forefather

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Scientists of our forefathers' day were convinced that they could turn base metal into gold.
Sheetrit maintained "Our forefathers' days have ended.